运用图论中的最短路径搜索算法从装配模型中自动搜索出功能约束尺寸链，确定零件的功能尺寸。
Utilizing the shortest path algorithm in Graph Theory to search functional dimension chains automatically in the assembly model and ascertain the functional dimensions of the part.
将零件进行特征基元体分解，通过分析基元体在组合成为零件时尺寸功能语义的变化来生成尺寸模型。
Disassembling a part into the features of basic entity (FBE), the dimensional models were gained by analyzing the change of the functional semantics of dimension during FBEs combination.
通过将零件上功能表面之间的相对位置、朝向以及拓扑关系抽象成定性符号集合，建立了概念零件结构定性模型。
By abstracting of relative position, orientation and topology relation between part function surfaces as a qualitative symbol set, the conceptual part structure qualitative models are presented.
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